Thermostatic valve.



; L. S. LAWSON.

THERMOSTATIG VALVE.

APPLICATION FILED H0V.10I 1911.

I Patented Sept. 10,1912.

mwrarrronfzamm- LINDLEY s. Lawson, osrromnsrnan,PENNSYLVANIA, nssreno nTO LAW on'lvranu- FACTURING COMPANY, or HOMESTEAD, rnrgnsrr UNITEDsrnzrnsj ran-TENT ounron PENNSYLVAIF'IA.

VANIA', A oonro A'IIONV on 'rHERMos'raTro VALVE.

To on whom it may concern: I

Be it known that I, LINDLEY S; LAWSON,

a resident of Homestead, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improve ments inThermostatic Valves, of which the following is a specification. I

This invention has particular reference to a thermostatic valve forautomatically controlling the flow of gas to'a water'heater, and thegeneral objects are to provide a new and improved valve construction,and improved means for varying the throw of the valve and therebyadjusting it for different temperatures of water.

Inthe accompanying drawings, Figure '1 is a longitudinal section ofvalve mechanism constructed in accordance with the inven tion. Fig. 2 isa view in perspective of the valve mechanism with the cap-liketemperature adjusting head separated from the valve actuating rod. Fig.3- is a similar View 'with theparts fully assembled.

Referring to the drawings, 2 designates a valve body constructed withgas inlet 3 and v outlet 4 which communicate with the body at oppositesides of seat 5 on which operates valve 6. Body 2 is formed with anopening facing the seat which is closed by head 7 the body having arim-like extension 8 outwardly from the opening, at one side providedwith. temperature indications 9. Body 2 is formed with a tubularthreaded extension 10 adapted to be secured in the wall of a standboiler or other water container, not shown, and projecting fromextension 10 into the interior of such boller is the thermostatic tube11, formed preferably of co per, provided at its outer end with socket12.

Secured'to and projecting from valve 6 is the iron or steel rod 13 whichextends into tube 11, and at its outer end is threaded at 13 toadjustably engage socket 12. Valve 6' is constructed with the centralstem 14, with which rod 13 is in alinement. The stem extends throughstufling box 7- in head 7,- and is milled at 15 to receive the cap-likewith which the vv1de a firm hand-hold for bypass 22, controlled byoperating with the seat Serial in. 659,580.

Specification of Letters Patent, Patented Sept. 10 1912 Applicationfiled November 10, 1911.

pointer .20 on the; head is adapted to cooperate, A lug 21 on the underside of head'16 moves in slot 8 in rim '8 and'limits the adjustment ofthe head. The periphery ofhead 16 ifs-milled at 16 to proadjusting thesame. I

' Withutube 1 1 and rod 13 formed ofmetals having different coefficientsof expansion, it

will'be understood that the heating and expanding of tube ll'by thewater within the boiler will move rod 13 longitudinally and seat valve 6and-shutofi the flow of gas 'to theheating means, while contraction ofthe tube will move outwardly and unseat the valve. IAnd byadjusting thethreaded connection of the rod by means of head 16, the valve may becaused to close when the water attains'any desired temperature, thepartsbeing so accurately connected by the described construction thatthe valve will close when the water attains the temperature des-,lgnated by the pointer 011 the scale of temperature appearing on thevalve body.

To prevent the heaterafrom being entirely extinguished valve 6 may 'beprovided with the adjustable plug 23, so that even when the valve isclosed and the main supply cut ofi sulficient gas will pass to sustain apilot light for igniting the flow when the valve opens. p

1. The combination of a valve body having a gas inlet and a gas outlet,the body having a valve seat interposed between the inlet and outlet andwith the body open outward-1y from said seat and threaded internally, athreaded head fitting within and closing the open portion of the bodyand provided with a central opening, a valve 00- and movable between thelatter and said head and having a stem which extends through the headopening, a

cap-like head secured to the projecting stem and fitting and rotatablerelatively to the body, a tubular thermostatic device extending from thevalve body, and a rod secured to the valve and adjustably connected tothe thermostatic device. v

2. The combination of a valve' body having a valve seat and at one sidea rim-like extension and with temperature indications on said extension,a valve a thermostatic device projecting from the valve body, arotatable rod secured .'to the valve and having threaded connection withthe thermostatic device, and a cap secured to the valve and flanged to'inclosethe rim-like extension of the body, the'flange of the cap beingrecessed to expose said temperature indications, and the cap having apointer for registering with one or another of the indications.

3. The combination of a valve body constructed at one side with anannular slotted extension a thermostatic valve, a valve operating rodrotatable for varying the throwof the valve, a headsecured to the valveadjacent the annular body extension,

nular extension for limiting the movement of the head, the body havingtemperature indications, and the head having a pointer.

for determining the temperature at which the valve is set to close.

4. The combination of a valve bodyhaving a gas' inlet and a gas outlet,the body.

, a lugon the head movable in the slot of the anhaving a valve seatinterposed between the inlet and outlet; and with thebody open outwardlyfrom said seat, ahead secured within and closing the open portion of thebodyand provided with a central opening, a

valve cooperating with the seat. and movable between the latter and saidhead and having a stem which extends throughthe head opening, a headsecured to the projecting stem and closing the. outer open portion ofLI'NDLEY s. LAWSON.

Witnesses:

M. F.- HILLMAN, JOHN W. BAINBRIDGE.

